<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .box {
        width: 200px;
        height: 200px;
        background-color: rgb(187, 150, 156);
        /* border-radius: 50%; */
      }
    </style>
  </head>
  <body>
    <div id="app">
      <!-- <div class="box" :style="{'border-radius': '50%'}"></div> -->
      <div class="box" :style="styleObj"></div>
      <button @click="add">添加css属性样式</button>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          styleObj: {},
        },
        methods: {
          add() {
            this.styleObj = { borderRadius: "50%", backgroundColor: "red" };
          },
        },
      });
    </script>
  </body>
</html>
